RGB Optical Parametric Oscillator Source for Compact Laser Projection Displays

1
RGB Optical Parametric Oscillator Source for
Compact Laser Projection Displays

• K.J. Snell, D. Lee, B. Pati and P.F. Moulton
• Q-Peak
• 135 South Road
• Bedford, MA 01730

2
Outline

• Background
• Results to date
• Scaling to higher powers

Support AFRL (WPAFB) Phase I and II
SBIRs Contract F33615-99-C-6009, Reginald Daniels
3
OPO-based RGB source
896 nm
448 nm
1047 nm
523 nm
Blue
OPO
SHG
Green
Red
1256 nm
628 nm
U.S. Patent 5,740,190
4
Relation between red and blue wavelengths
5
CIE chart indicates gamut
6
RGB OPO Results
7
A temperature-tuned NCPM LBO OPO is the key
element in the system
523.5-nm pump
8
Q-Peaks design obtains high efficiency andhigh
beam quality with side-pumping
Diode laser
Cylinder lens
Laserbeam
Lasercrystal
Pumpbeam
Diode laser
Multi-Pass Slab (MPS) US Patent 5,774,489
Gain Module
9
Photograph of actual Gain Module
10
With the Q-Peak MPS DPSSL design, diode to laser
conversion is in the 35-50 range
11
Old pump-laser configuration produced10W at a
10-kHz pulse rate
Pulse rate 10 kHz
12
Schematic of RGB OPO
13
OPO efficiency exceeded 60
14
Watt-level doubled OPO outputswere generated
15
The new pump laser design generates30 W of power
from 10 - 50 kHz
Oscillator
26.5 W (CW)
Gain Modules
LBO doubler
30 W _at_523.5 nm 10-50 kHz M2 ? 1.1
Amplifier
Total diode power 128 W (optical)
54 W (CW)
16
Pump laser IR to green conversion is 60
17
High-power operation - The numbers
18
RGB OPO in the laboratory
19
RGB optics (pump and OPO)packaged in 23 rack
chassis
LBO doubler
OPO and red SHG
Pump oscillator
Blue SHG
Pump amplifier
RGB fiber outputs
20
Entire system package withcontroller, power
supply and chiller
RGB optics
Controllerelectronics
Power supply
Cooler